Electric switch.



No. 817,222. PATENTED APR. 10, 1906.

H. E. CASE. ELECTRIC SWITCH.

APPLICATION FILED MAIL-24.1904.

INVENTOR: M 5. (c w.

i MTTOHNEY.

or it it l lll lillllfittlllllll llllll tllllllilll l Lilli,

, no. dimes,

fipecification of Letters Itntont.

Irntontod April 10, 1906,

A lication filed March 2d. 190 Burial lluv 199,738.

To (l /i i! whom, it 'rrmy concern:

lilo it known that I, l-lli'norn l (Lists, c citizen of tho UnitedStates, and a rcsidcnt o1 llzlridgcport, in the county cl .l niriicldand Stntc of Connecticut, have invcntcd cortnin now and uscfullinprm'cincnts in lfilcctric Elwitchcs, of which tho following is cspoci'li cation.

ltliy invcntion rolctos to improvcnicnts in clcctric switches, lUlLlparticularly to that class known as "knifc sn'itchcsF The ohjcct oi. myinvcntion is to inorcnso the conductivity by all copper contact with--out incrcnsing tho cost oi construction.

Copper lacing tho host conducting nmtcricl, it is always uscd to formtho direct contact of thc knii'c and hhidcs of ai switch; but owing tothc cost of copper other hnscr .nnttorinls, lilrc brass, are usod forother ports of the blades. 'llhcrefore it is customary to inscrt brassbushings in tho lower part of tho hhuics to hold the contact-wires.'lhis construc tion is olojcctcd to hy tho underwriters s nottransmitting sniiicicnt amount oi current. To nmlrc this crashing; of co)pcr would entail on ndditioncl ozrponsc both for tho coppcr rinddrilling the hole therein for the contact- Wirc. Another irnportnntioaturc rcquircd by underwriters is that tho rnctal must he thick enoughto form a, sullicicnt number of threads for the binding and rctniningscrcws to hold.

My invention consists in forming ttchair for the support of the copperhlodcs cithcr lay making this chair of one oi the blades, While theother blndc has n tubular and to rccsivc tho contact-wire, which tubularend is located in the chair, or by making" or separate choir of brass,iron, or any othcr chczip mm tcrial of sufficient thickness to containtho necessary threads for the binding and rotciw ing screws and toscours an clhcoppor contoot by moons of thin copper blndcs inserted andfastened in said chain For it full and clcnr undorstnnding of myinvention rctorcncc is had to tho accompany in drawings, in which--*igure 1 is a) side elevation of c. lowdoswitch, showin v myimprovodcontacts and hrokcn vicw o" contactwvircs therein, fig.

2 is an enlarged. scctionol View of tho insulctcd boss and frontelevation of one oi the. contacts with s sectional View oi o contact-Wirc thcroiin Fig. 3 is an cnlnrgod detail 5 front elevation 01 thecontcct shown at Figs.

1 and 2. Fig. 4% is on enlarged. modified con.-

struction shmving o dctnclnihlc chair with co iipcr hlndos scouredthcroin Fig, 5 on on nrgcd dctnil view of the choir shown at l ig, -1.Fig. ii is an cnlnrgcd dctnil modiliod constrncthm oi? tho detachablechair.

c modified construction of tho hicdcs shortcnod and attached to n choir,n suction oi c, tuhc looctcd in tho choir rind in contact with thoblades.

its construction and operation crc lows:

lh-lcrrinc; to liiy s. l, 2, mod 3, l and 2 airs tholcnvcs or hhnlizsarranged in. pornllcl rc-- lotion to ndn'iit tho lrniio .l. i The bindsl is nnido long enough to form the choir portion 1, herring is. straightlinsc or sent and par ticllystr ight sidcs odnptod to ho scotcd in thosi narc groovo or chunnchwny ll. of the lnisc 5. 'l lis squnro choiriorrnntion and sqiuirc groove or chztnnrlwcy will cll'cctunlly prcvcnttho contact swiveling on tho hiisc Tho lowcr mid of thc hladcl iscnrriod nronnd to form, the othcr sido of ti "hair and is hroughtitgcinst tho hlndc it, (intending lair cnough up to give it good hrmsupport to both hlndcs and sccnrcd thcrcto and tothc blade 1 by moons oftho rivct G. Tho blrtdc Zcxtcnds within this chair formation oi" tholilndc l and is'providcd with tho tubular POI tion 2 to admit cithcr oftho ontztctwviros 7 or 8. A thrcodcd holc cxtcnds through tho hnsc oithis chair formation of tho blade 1 and through the tubular portion 2 ofthe blade J in! tho rctcining-sorcw 9, Fig. 2, and through the sidcs forthe hinding-scrcw 1.0.

From the chovc description it will rccdily' he soon that c strongconstruction and. on, allcoppcr contact is secured of compnmtivcly thininctcl The copper hladcs nccd ho of no thicker nin-tcricl than is'rcquircd to convoy tho current and stand thc fatigue incidcntnl to thecngsgcmcnt of tho lrnilc thsrcwith, whilo thc combined thiokncss'ol thotwo coppcr lolcdcs will furnish sinplc threading ca pccity for both thobinding .iuid rctaining screws.

Tho some results are obtained, as chovo dc scribed, in the construct-ionshown at Fig. 4,

. combined niche a tubular ri-zccptcclc for the GOHlJEt-Gtflt'llo. l3(soc also Fig 5)'is n choir adapted to he soctc'd in the square groove lof tho insulctcd boss 5, n which the two for iht screws.

blades 11 and 13 are firmly socnrs-d h mums 'lht: a-hnir 2. (win ho mMlC01 of suilirit-nt thickness in h w the nmvssnnv snpnnit to the bladesand holding impurity in? the svx'ews. in (his cmisti'nvtinn it is-nntnot'vssm'yfor the retaining-screw f) to prnjvvt thrungh the hot {win 1'the (llzlll int'n thv tnhnlnl' feirsinttinn of div hhnws, its the (hairwill he thivk enough tofurnishsnllivient mnnhcinf threads While they endof the hindig-st-mw It) wiil prnjott tin'ungh :i hole in no of theHtlllltlit'lllttl tHHHHlUIIS 0f the hides, it is nnt nvt-vsszny thatthis hole he threaded, us thtonly PHI'PUSP Of this st-i'ew is to bind'thv t-nnt'zn't-xvirv. The (hair 13 is nnide of thick shwt nn-tnl huntinto the prnpoi' form tn ILCtii' thtends of the bill-Q03 While thvinnditi'ed (UHSlIlHllUil 13 of this than (shown at Fig. (5) is within(first or nia t-hined out, of snlid stock. In this wnstt'uF- tion thesent 13 is adapted tn miter the Si'llttilt gronve U1 (llillllll*l-\'\'il-l ol-thv insulated base 5. in tin, nmdilimiiinn shown at Fig 7 Th0blades 1:") and 16 an shortened and as? against thv top of the mppm'tnhwsvuion 17, insvi'ivd in tliv (-hnii' 1.55. This mansti'mtiun/lilcvtho ()ilHTS insures an all-stag per whim-t.

i rnni tin ftn'vgning dwm'iptinn it will T'Otitiily ho seen that thvdominating: funtnrv {)f any i'm'entinn is tn surnrv an nil vnppnit'nntuct with littlv (W130 ndditiunni oxywmv Ufllllllill fut-turn. Tom'tnntplixh this, tin i'hnir for nnttinn an indispt-nsahlv imtnt'iwhether the chair is a part of one ni' tht: hlzulvs 01 l5 :1 svpinntvplum into whit'h lllt hlndm s 0- Cuitii. 'lhis t'hnir mature in nnv man,in for: nit-ntinnvd, is fni'nwd by dnnhiing; my (3110 01' thv Thin 00mmblades tn givitlw Itttfi siny viniir-snppmt and in the Ulilti' matthethin ('uppt'r hlndm are insvstvd in :1 Chan: of lmsm' and chvnpviJIHtiF-Xltll, so that in hither cast an till-cup 01 t'mitzit't issfcuzwd.

The 'dvtuvlninlv (hair win he used without any (jiltlllgfi to him nconnect inn not Ween Lin:

knife 3 and t :2 Wooden handle 13, shown ni' Fig 21, t'ifatri /w 1.)extvnding" through the handle l8 and into it thrmded hole in the bottomof the chair.

Having thus dcsc'rihed. my invention, What i ciaim as new, and desire toseeure'hy Lettt-i's l aiie nt, is-

i. A RHifQSWiU'h having an insulatinghas e provided with an Mininggroove 01 channel-imp, a contzwi'. comprising blades of format lengths,iiie ()W1Z end of one blade enveloping the iuwezend of the :ther bladewith 21v ('lmiFlil-K Formation adnptmi to be seated in saidllit'iIlILGl-WLY and be secured illtl'tin, means; on the laws? end atthe other Mild? to vmhmte the commit-wire, means for securingsnidhlzides together at- :1 pain i: abuva said contact-Wire, fur the purposeset fairth.

.2. in n knife-switch the combination with an insulntingdmse havin n tlnmncbwagi, of 1 contmt cnznprising ilndes of unequal lengths, andhaviing this Hyper ends in pamh lc-l relation to receive the mini! andform the vat-51mm, a #:hair 'n'nten (a-f tht luwer 1 nd of 'ilK'longesthhido adapted to he socanwd in said climini im'ny, int-ans forsecuring the mid nf said long iii: d9 the Vilil-Cttl body p01"- tin 0ihath liludvs and {ilBtfl/P mini (h-6111', the ltz-wvr f! of t shortest011119 zuiapftwii to mnhmt-t' 3 001231!(tr-Wit? and within s; id'i'intit'. l nt thv PUZPOHP set forth.

is} Jain l t it the shorter blade having 21 sea for 21 liltt'i-I'i'ilt,ti t-imir fanned of the longar blittlt ndziptvd i0 tltiifitlii said5021i; means n? :em'ut'ing ihv extreme lower end of the iiHLfiSl hiadein the wi't'ical hotly portinn 0? but i hlndvs, lni ino pul'posv setfnrtli.

iiignvd at iiiingvpnrt, in tin}. vounty of i ni id and State (iiionnectit'nt, this th day ni' Blarvh, )1. i) 1904 HAROLU ii. i'nnim'tfan" i: linii'v-switeh ('tnnprising h s of unequal imigths, iii-9 QOXHT-

